Why Higher Oil Prices Rattle Asian Stocks

On 8 October 2026, Asian stock markets experienced a sharp decline due to rising oil prices. The Nikkei 225 fell 1.4% to 69,042, while the Kospi dropped 2.6% to 6,626, marking one of the largest declines among major Asian indices. The Shanghai Composite also saw a slight decline of 0.8%. The Hong Kong Hang Seng Index also saw a decline of more than 1%.

The main reasons for this decline were the impact on trade, costs, and US interest rates. Japan and South Korea, which have limited domestic crude production, rely heavily on oil imports, making them vulnerable to price fluctuations. India and China also heavily import oil, broadening their import bills and negatively affecting their currencies.

Rising oil prices increase transportation, manufacturing, and food costs, as well as leading to higher headline inflation, which puts pressure on central banks to maintain interest rates.

Additionally, the US Federal Reserve's decision to raise interest rates further erodes the attractiveness of Asian stocks compared to US bonds. Technology shares are particularly vulnerable, as chip stocks fell by more than 3%. Notably, companies such as Brazil's Petrobras and Colombia's Ecopetrol, which produce more crude than they consume, benefited from higher prices, with Petrobras shares rising by 2.9% and Ecopetrol shares by 1.9%.

Investors have been making prediction markets on the future trajectory of oil prices. Polymarket shows a 62.5% chance that West Texas Intermediate (WTI) will reach US$95 by October 2026 and a 35% chance of reaching US$100. However, there is also a 94.5% chance that WTI will dip to US$90 and a 59.5% chance it will drop to US$85. These predictions have resulted in over US$1.3 million in trades.

Investors should monitor various factors such as the US–Iran standoff, the US consumer price report, weekly crude inventory data, and the yen exchange rate, as well as any news on tanker passage through the Persian Gulf, before making investment decisions.